Universal tool-grinding machine.



W. J. RENNIE.

UNIVERSAL ooL GRINDING MACHINE.

APPLICATION FlLED JAN. 5. 1918.

1 ,326,423. Patented Dec. 30,1919.

2 SHEETS-SHEET l.

W. J. RENNIE.

UNIVERSAL TOOL GRINDING MACHINE.

APPLICATION FILED IAN. 5, |918.

Patented Dee. 30, 1919.

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WLLIAM JAS. BENNIE, OF TORONTO, NTA-RIO, CANADA, ASSIGNOR TO TRONTU TYPE FOUNDRY COMPANY; LIMITED, F TORONTO, ONTARIO, ANADA.

UNIVERSAL 'IOOL-GRINDING MACHINE.

Specication of .Letters Patent. Patented lDcB., 3th, 19h90' Application filed January 5, 1918. Serial No. 216541.75.

To all wwm it may concern."

Be it known that I, WILLIAM J. Ranma, of the city of Toronto, in the county of York, Province of Ontario, Canada, a sub.- ject of the King of Great Britain, have invented `certain new and useful improvements in Universal Tool-Grinding Machines, of which the following'is a specification.

This invention relates to machines particularly intended for grinding milling cutters, lathe tools, ldrills and other machine shop tools, and my object is to devise a machine which is adapted for the grinding of the largest possible range of tools without the use of special attachments which require to be connected to and disconnected from the machine. More particularly my object is to improve the machine shown and .describf-:d-in Canadian Patent No. 176,772

dated May 1, 1917, which attained in some measure the desired objects, but is not adapted to as wide a range of work as is desirable, nor is as convenient in operation.

rThe improvements in construction referred to are hereinafter particularly described and illustrated in the accompanying drawings in which- Figure 1 is a side elevation, partly in section, of my improved grinder;

Fig. 2 a front elevation of the same partly in section;

Fig. 3 a plan view of the same;

Fig. 4 a detail showing in plan the improved clamp for the motor base;

Fig. 5 a detail in front elevation of the same;

Fig. 6 a side elevation of the same;

Fig. 7 a sectional view of the clamp as shown in Fig. 6;

Fig. 8 a detail in plan of the tool clamping device; and

Fig. 9 a detail in side elevation of parts of the apparatus showing the use of a form for guiding the movements of the grinding tool.

Fig. 10 is a cross sectional detail illustrating the key for preventing rotary movement of the table-carrying knee and also the mechanism for operating the same.

ln the drawings like numerals of reference indicate corresponding parts in the different figures.

1 is the base on which is supported the standard 2. 0n this ,standard slides the table carrying knee 3, The Sleeve it 0f this rocking the spindle,

knee is partly split -as shown and is provided with the clamping screws 5 by means of which it may be clamped to the standard at any height and at any desired horizontal angle. i

ln certain operations itis important that the table of the machine and the parts carried thereon be moved vertically in a given position with the greatest accuracy. ll therefore provide the following arrangement for the accomplishment of this result. The key- -way 6 is formed vin the standard and a groove 7 in the knee 3.' In this groove is carried a feather key 8 adaptedto -be received wholly within the-groove or projected to/lie partly in the keyway and partly in the groove.v To 'protect and retract this key I provide a spindle 9 journaled in the knee and carrying an eccentric 10, the eccentric strap 11 being secured to the back of the key 8, the handle l2 provides means for rocking the spindle. lt is evident that by the key may be forced into the keyway orretracted as may be desired. When the. key is in the keyway, vertical movement is possible only in a given vertical line, no rotary movement of the knee being possible. When it is desiredV to rotate the knee, the feather key is withdrawn and the clamps 5 depended on to hold the knee in any desired position of vertical or rotary adjustment.

The knee is raised and lowered by means of a telescopic screw, which comprises the inner screw 58, which is threaded into the outer screw 59. The lower end of the inner screw is connected to the shoe which rests on the circular `flange 61 formed at the foot of the standard 2. This shoe tits over the edge of the flange and is provided with the anti-friction roller 62. The shoe will thus not rotate, but ismovable in a circular path around the standard. The outer screw 59 passes through the jaws 63 formed on the knee 3 and a nut 64 located between the jaws is threaded thereon. Preferably a ball bearing 65 is placed between the nut and the upper jaw totake the upward thrust.

0n the nut 64 is formed a bevel gear 66 with which meshes the bevel pinion 67 fast on the spindle 68,' journaled in suitable bearings on the knee, and provided at its outer end with the hand wheel 69. The geueral construction and arrangement of tuch telescopic screws is well known in the fart much greater range@ of vertical movement,

is possible than with the use of a .single screw.

The knee carries the table 13, which is movable on the guides 14 to and from the standard 2. An adjusting screw 15 of ordinary construction -engagingboth the table and the knee provides means for electing.

the adj ustment. Y

16 is a slide transversely movable of the table on the guides 17. The under side of this slide is provided with a rack 18 with which meshes the skew gear 19 screwed to a spindle 20 jou-rnaled in the table and provided with the hand wheel 21. Adjustable screw stops 29 oi ordinary construction are provided orlirniting the travel of the slide, these stops being; secured in position by mea-ns of undercut slots 30 formed in the'i'or.- ward-edge of the table, s uch constructions beingcoinmon in the art.

Onthe slide is' pivoted the bed'22, the

pivot being formed by thel screw 23. The

bed may thus be rotarily adjusted in a horizontal plane. A graduated scale and ver nier as shown in the plan view is preferably provided for convenience in adjustment. rlhe bed is clamped by means of a screw 73 passing through anbed and h-readed into the slide. Thisl bed 22' carries t5ol-holding means. "I show Jfor this purpose the head stock 24 and tail stock 25, one-or both of which are adjusted lengthwise of the bed in a manner common in lathe construction. The head stoclris provided with a rotating center 26 driven y the pulley 27. In practice this pulley will be driven by an electric motor (not shown) which is secured to the edge of the bed, which is provided 'witha suitable undercut slot 28 for that purpose.

The grinding tool issupported on the head of the standardv 2 inthe .following manner. A rocking head 31 is pivoted horizontally at the upper endof the standard, which is split to receive the hinge knuckle 32 formed on the under side of the head. A clamping bolt 33 forms the pivot. After the'liead has been adjusted to the desired angle, it will be clamped 'in position by tightening 'up the nut of the clamping bolt. On the yrockin-ghead .a carriage 34 is pivoted to turn on an aXis at right angles vto the aXis of the saidhead. The pivot is formed by a screw 35 which may be tightened up to hold the carriage in anyposi'- tion to which it may be turned. A slide 36 supported on the carriage is adapted to move on the guides 37--i`n a plane to which the a-Xisof the carriage is substantially perpendicular. The slide may be clamped when desired by means of the set screw 3S threaded through one of the guides and en arc-shaped slot in the end of which is pivoted to the link 40 pivf oted at its otherend on the frame of the machine. Intermediate its ends the lever is pivotally connected with the stem 41 connected to the slide. j

j On the slide is supported the base 42 of the frame 43, on which is journaled the spindle of the grinding tool 45. The base 42 is adapted .to rota-te on `the carriage:J the screw 46 forming the pivot.y llt will be noted that the slide 36 has a cylindrical boss 47 fitted in a cylindrical recess in the base 42 ci greater diameter, so that a .split ring 7 0 may be fitted inthe annular recess so formed between the outer 4wall of the boss and the inner wall of the recess. One end of this split ring is anchored by the screw 71. The other 'end is engaged by the i-nner end of the screw 72 threaded through the. base. By

tightening this screw the split ring may be contracted to bind on the boss 47 and thus clam-p the base 42 with. the axis of thegrindy ing tool at any desired angle-'to the direction of travel of the carriage 34.

ln practice 'an electric motor 48, shown only in outline, is directly co` lnected tothe spindle 44 and forms the driving means' therefor.

In connection with the grinder I employ ya'tooth rest and tooth rest clamp as illustrated more particularly in detail in Fig. 8. A stem 49 is fitted into a socket on a bracket 50. secured to the bed 22. This bracket is preferably slotted and issecured in position by the clamping screw 51. The. stem 49 may thus be set in any desired position relative to the line of centers of the head and tail stocks.

is a disk havinga hole formed therein parallel to one iacev for the passage of the said stem, and opening partly through said face. A second disk 53 has a'hole formed therein parallel to the face adjacent the first stem 54 Awill project slightly through the adjacent faces of the disks 52 and 53. Between the disks is located a 'third disk 55, the opposite faces of which are milled or otherwise roughened. '1A `bolt 56 passes through all three disks and has a wing nut 7 57 threaded on its end'. ltis evident'that by screwing up the nut that vthe disks will be clamped tightlyI -together to securely clamp the stems 49 and 54. When the nut is loosened. the end of the tooth rest may be v brought to any 'desired position and rigidly1 held'thc're by tightening up said Wing nut.

The tooth rest is required to engage the teeth of a milling cutterwhen the latter is held between the centers'of the head and tail stocks to be operated on by thel grinding rocking head to carry the support of agrinding tool, yet it is, as far as the applicant is aware, new to support the grinding tool to slide freely to and from the toolholding de'dre and to provide the rotary adjustment for the base 42 on which the grinding tool is supported. By so arranging the device l am able to bring the grinding tool and Work into coperative relationship from so many angles and in so many different Ways that special attachments are practically entirely dispensed With. lt is of special importance that not only the grinding tool be moved to and from the Work,but also the angle of its axis of rotation to the line of travel varied as may be desired.

For some classes of 4Work it is desirable that the movements of the slide 36 be automatically controlled to move the tool relative to the vvork. Means for this purpose are illustrated more particularly in Figs. 4 and 9. A fulcrum member 74 is protided with a stem Which may be clamped by set screws 75 in a hole formed in the carriage 34 adjacent the slide. A. lever'76 of the first order is suitably fulcrumed on the member 74. @ne end of this lever is connected by means of the pivoted link 77 With a lug 78 secured to the slide 36. `'llhe other end of the leverav is adapted 4to engage a form 79 which in practice is secured to some suitable part moving- With the Work. When this part of the device is in use the carriage 34 Will usually be so set that the slide tends to move under the influence of gravity, so that the form engaging the end of the lever tends to move up. The form therefore engages the upper side of the lever end. Preferably a ball 80 is journaled on the lever end, as a proper engagement With the form is thus secured no matter to What extent the lever be rocked. The form as shown is secured to the bed 22, Which carries the tool-holding means. lf this bed be moved to and from the slide 36, the form Will move to and fro over the ball 80, thus causing the slide to move up and down in correspondence with the curve of the former. Any Work carried by the bed may thus be ground readily to the curve of the form.

What 1 claim as my invention is :H

1. In a tool grinding machine, the combination of a suitably supported bed; Work holding means carried thereby; a head sup-` ported to rock on a horizontal axis; a cari bmation of a cyllndrical standard; a base riage rotarily adjustable on the head on an axis at right angles to the axis of said head; a slide suitably guided on said carriage to freely move rectilinearly in a plane to which the axis of the carriage is substantially perpendicular; means for reciprocating the. slide; and a grinding tool rotatably supported on said slide.

2. In a tool grinding machine, the combination of a suitably supported bed; Work holding means carried thereby; a head supported to rock on a .horizontal axis; a carriage rotarily adjustable on the head on an axis at right angles to the axis of said head; a slide suitably guided on said carriage to freely move rectilinearly in a plane to Which the axis of the carriage is substantially perpendicular; means for reciprocatingr the slide; and a grinding tool rotatably supported on said slide with its axis in a plane substantially parallel to the plane in which the carriage moves.

3. ln a tool grinding machine, the combination of a suitably supported bed; Work holding means carried thereby; a head supported to rock on a horizontal axis; a carriage rotarily adjustable on the head on an axis at right angles to the axis of said head; a slide suitably guided on said carriage to freely move rectilinearly in a plane to which the axis of the carriage is substantially perpendicular; means Afor reciprocating the slide; a grinding tool base rotarilyadjustable on the slide on an axis substantially parallel to the axis of the carriage; and a grinding tool rotatably supported on said base. v

4. ln a tool grinding machine, the combination of a standard having a longitudinal keyivay formed therein; a table carrying knee vertically and rotarily movable on said standard and provided with a groove adapted to-be brought into coperative relationship to the keyway; a feather key normally contained in said groove but adapted to be projected to lie partly in the key-Way and partly in the groove; and means carried by lthe knee for projecting and retracting said 5, ln a tool grinding machine, a tooth rest clamp comprising a suitably supported stem; a disk having a hole formed therein parallel to one face for the passage of said stem and opening partly through said face; a second disk having a hole formedl therein parallel to the face adjacent the first mentioned disk and opening partly through said face; said hole being adapted for the passage of a tooth rest stem; an intermediate disk between the .two aforesaid disks, having roughened faces; and a clamping bolt and nut by means of which the three disks may be drawn together to clamp the stems aforesaid.

lllll` 6. In a tool grinding machine, the comraising and lowering the knee suitably coni nected with thel knee; a shoe to which the lower member ofthe telescopic screw is connected7 said shoe fitting over the rim of the base aforesaid so that it cannot rotate but is free lto move around the periphery of the rim.

7. In a tool grinding machine, -the com- 'bination of a suitably supported bed: work holding means carried thereby; a carriage; a slide suitably guided on said carriage to freelyv move rectilinearly thereon; means for reciprocating the slide; a grinding tool rotatably supported on said slide; a universal joint support for the carriage; and means for clamping the said universal joint. 8. In a tool grinding machine, the combination of a suitably -supported bed; Work holding means carried thereby; a carriage;

a slide suitably guided on said carriage 'to' freely move rectilinearly thereon; *means for reciprocating. the slide; a grinding tool 'base rotarily adJustable on the slide .on v,an aXis normal vto the plane in which the slide rand horizontally movable bed; Work holding means carried thereby; a form carried thereby; a carriage adjacent said bed; a slide suitably guided on said carriage; a grinding tool rotatablv lsupported on said slide; anda lever ulcrumed on the carriage adapted at one end to engage the form and at the other to move the slide.

Signed' at Toronto this '11th day of Dec.. A.. D. n n

WILLIAM JAS. REN-NIE.

moves; a grinding tool rotatably support- 

